X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=lib%2Ffilters%2Falpha.c;fp=lib%2Ffilters%2Falpha.c;h=1dcd328916fef4aeead62b6aa2717c06a2e226bd;hb=5e60b81690ac5883abe4f68b61814b8764604fd1;hp=0000000000000000000000000000000000000000;hpb=944d0b42a196bd412c12c6c06fd0e4f301d4a1c7;p=swftools.git

diff --git a/lib/filters/alpha.c b/lib/filters/alpha.c
new file mode 100644
index 0000000..1dcd328
--- /dev/null
+++ b/lib/filters/alpha.c
@@ -0,0 +1,116 @@
+/* alpha.c
+
+   Part of the swftools package.
+
+   Copyright (c) 2010 Matthias Kramm <kramm@quiss.org> 
+ 
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include <stdlib.h>
+#include <memory.h>
+#include "../gfxfilter.h"
+#include "../gfxtools.h"
+#include "../types.h"
+#include "../mem.h"
+
+typedef struct _internal {
+    U8 alpha;
+} internal_t;
+
+static inline gfxcolor_t transform_color(internal_t*i, gfxcolor_t*col)
+{
+    gfxcolor_t col2;
+    col2.r = col->r;
+    col2.g = col->g;
+    col2.b = col->b;
+    col2.a = (col->a * i->alpha)/255;
+    return col2;
+}
+
+static void maketransparent_stroke(gfxfilter_t*f, gfxline_t*line, gfxcoord_t width, gfxcolor_t*color, gfx_capType cap_style, gfx_joinType joint_style, gfxcoord_t miterLimit, gfxdevice_t*out)
+{
+    internal_t*i = (internal_t*)f->internal;
+    gfxcolor_t color2 = transform_color(i, color);
+    out->stroke(out, line, width, &color2, cap_style, joint_style, miterLimit);
+}
+static void maketransparent_fill(gfxfilter_t*f, gfxline_t*line, gfxcolor_t*color, gfxdevice_t*out)
+{
+    internal_t*i = (internal_t*)f->internal;
+    gfxcolor_t color2 = transform_color(i, color);
+    out->fill(out, line, &color2);
+}
+static void maketransparent_fillbitmap(gfxfilter_t*f, gfxline_t*line, gfximage_t*img, gfxmatrix_t*matrix, gfxcxform_t*cxform, gfxdevice_t*out)
+{
+    internal_t*i = (internal_t*)f->internal;
+    gfximage_t img2;
+    img2.width = img->width;
+    img2.height = img->height;
+    img2.data = (gfxcolor_t*)rfx_alloc(img->width*img->height*4);
+    int x,y; 
+    for(y=0;y<img->height;y++)  {
+	gfxcolor_t*in = &img->data[y*img->width];
+	gfxcolor_t*out = &img2.data[y*img->width];
+	for(x=0;x<img->width;x++) {
+	    out[x] = transform_color(i, &in[x]);
+	}
+    }
+    out->fillbitmap(out, line, &img2, matrix, cxform);
+    rfx_free(img2.data);
+}
+static void maketransparent_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_t*color, gfxmatrix_t*matrix, gfxdevice_t*out)
+{
+    internal_t*i = (internal_t*)f->internal;
+    gfxcolor_t color2 = transform_color(i, color);
+    out->drawchar(out, font, glyphnr, color, matrix);
+}
+static void maketransparent_fillgradient(gfxfilter_t*f, gfxline_t*line, gfxgradient_t*gradient, gfxgradienttype_t type, gfxmatrix_t*matrix, gfxdevice_t*out)
+{
+    internal_t*i = (internal_t*)f->internal;
+    
+    gfxgradient_t*g = 0, *prev = 0;
+
+    while(gradient) {
+	gfxgradient_t*n = rfx_alloc(sizeof(gfxgradient_t));
+	n->pos = gradient->pos;
+	n->color = transform_color(i, &gradient->color);
+	n->next = 0;
+	if(prev) {
+	    prev->next = n;
+	    prev = n;
+	} else {
+	    g = prev = n;
+	}
+	gradient = gradient->next;
+    }
+
+    out->fillgradient(out, line, g, type, matrix);
+    gfxgradient_destroy(g);
+}
+
+void gfxfilter_maketransparent(gfxfilter_t*f, U8 alpha)
+{
+    internal_t*i = (internal_t*)rfx_calloc(sizeof(internal_t));
+    i->alpha = alpha;
+
+    memset(f, 0, sizeof(gfxfilter_t));
+    f->name = "maketransparent";
+    f->internal = i;
+    f->stroke = maketransparent_stroke;
+    f->fill = maketransparent_fill;
+    f->fillbitmap = maketransparent_fillbitmap;
+    f->fillgradient = maketransparent_fillgradient;
+    f->drawchar = maketransparent_drawchar;
+}
+